chore(deps): update rust crate tiny_http to 0.12

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
tiny_http	dev-dependencies	minor	0.11 -> 0.12

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Release Notes

tiny-http/tiny-http (tiny_http)

v0.12.0

Compare Source

• Bumped the minimum compiler version tested by CI to 1.56 - this is necessary due to an increasing number of dependencies
  introducing Cargo manifest features only supported on newer versions of Rust.

• Add support for UNIX sockets

  Thanks to @​ColonelThirtyTwo for adding support for binding to UNIX sockets when creating a tiny-http server. This change
  makes a few small breaking API modifications, if you are constructing ServerConfig manually you will need to use the new ListenAddr
  type rather than directly supplying a net::SocketAddr. Likewise Server::server_addr() will now return an enum that can
  represent either a TCP socket or a UNIX socket.

  Finally Request::remote_addr() now returns an Option<&SocketAddr> as UNIX sockets don't ever have a remote host.

• Reduce required dependencies by switching to httpdate

  @​esheppa replaced our internal HTTPDate type with the httpdate library (used extensively in the community by Hyper, Tokio and others)
  which reduces our baseline dependency tree from 18 crates to 5!

• TestRequest::path no longer has a 'static bound, allowing for fuzzers to generate test request paths at runtime.

• Unpinned zeroize so it can float around any stable ^1 version.

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